<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>padding的复合属性</title>
</head>
<body>
    <!-- padding:5px;代表上下左右都有5px的内边距 -->
    <!-- padding:5px 10px;上下内边距5px左右为10px -->
    <!-- padding:5px 10px 30px;上内边距5px左右为10px下面20px -->
    <!-- padding:5px 10px 30px 40px;依次对应上右下左 顺时针 -->
</body>
</html>